Physical vapor deposition hard layer coated end mill and its manufacturing method

摘要

PURPOSE: To prolong the servicable period of time, and to restrain the state of wear within the normal wear by coating the base substance of a WC group cemented carbide end mill with a specific Co binding course density gradient layer. ;CONSTITUTION: The base substance of a WC group cemented carbide end mill is coated both with a Co binding course deficient layer 4 in which the content of a Co binding course 1 is less than 3/5 that in the mean composition of the base substance, and whose thickness is within the range of 5μm from the surface and with a Co binding course density gradient layer 5 which has a Co binding course density gradient such that the Co binding course density gradually increases from the Co binding course deficient layer 4 toward the inside, and whose thickness is less than 10μm. Further, a physical vapor deposition hard coating layer 3 on the surface of the base substance is formed on the Co binding course deficient layer 4. Thereby, an end mill excellent both in peel resistance and in breakage resistance can be obtained.;COPYRIGHT: (C)1993,JPO&Japio